Based on true events, deals with the Farewell Dossier, a little-known affair in which French intelligence services tipped off the United States about a Soviet spy operation believed to be responsible for massive theft of military and industrial know-how during the Cold War. Also focuses on unsung hero and KGB spy Col. Vladimir Vetrov--codenamed "Farewell"--who blew the whistle on the spy operation and was executed in 1983.